Lubricating oil feed device in an internal combustion engine

Abstract: Device for feeding oil from the lubricating oil system of an internal combustion engine to units (18) mounted on a unit supporting plate (4) secured to the engine block (2). On one side (12) of the unit supporting plate (4) there are one or more oil distribution ducts (14) incorporated in the plate, each of which is connected to the lubricating oil system of the engine and at least one associated unit (18), and which is covered, on the surface (12) of the plate, by a cover plate (24) secured in the unit supporting plate (4). Each duct groove (22) has its associated cover plate (24) preferably secured in the unit supporting plate (4) by shape and/or friction.

Description: The invention relates to a device of the type indicated in the preamble to patent claim 1. State of the art In motor vehicles, particularly heavier vehicles such as trucks and buses, there is an increasing need to provide or coordinate the vehicle engine with additional units of different types. In this case it may be a question both of units belonging to the engine such as an injection pump or a turbocompressor unit, and of units driven by the engine, for example an air compressor in a compressed air system for brake operation, or other equipment interacting with the engine. In the case of heavier trucks and buses in particular the vehicle engine is often a diesel engine operating on the basis of supercharging generated by means of a turbo-compressor. Lock-free braking systems are frequently also used in such vehicles, the brakes being operated by a compressed air system. A common feature of these types of vehicles and engines is the need to be able to fit the equipment concerned, and the units required for it, on or close to the vehicle engine, for drive and functional reasons. In a number of cases the equipment and units also require to be fitted with efficient lubricating oil systems. It is then appropriate for these lubricating oil systems to be coordinated with the engine lubricating system, and in practice this is achieved by incorporating the lubricating systems of the equipment/units respectively in the engine lubricating oil system. According to prior art equipment/units of the type discussed above are mounted on a common supporting part securely fitted to the vehicle engine. The type of supporting part used may, for example, be a supporting plate normally secured to the short side of the engine block adjacent to the clutch integral with the engine. This type of supporting plate is normally called a transmission plate. Lubricating oil is then normally fed to/from the equipment or units mounted on the transmission plate via external hoses or pipes which connect lubricating oil ducts of the equipment/units to lubricating oil ducts in the engine block. In this case the connections between the ends of the hoses/pipes and equipment/units and engine block respectively are normally made by means of nipples. In order to avoid the need for such external hoses/pipes between the units/equipment and engine block altogether, or at least to minimise this requirement, solutions have also been developed where the external hose and pipe connections have been replaced by die cast or drilled ducts inside the transmission plate itself. This certainly obviates the need for such hoses and pipes, but the transmission plate must, on the other hand, be designed as a cast cover which, because of the space required for the internal ducts, must of necessity have a much greater thickness than a conventional transmission plate with internal ducts. The disadvantages of such a cast cover provided with internal oil ducts are, among other things, that it has a large design thickness, it is expensive to manufacture, and it is very heavy. Objective of the invention The objective of the invention is to avoid the disadvantages inherent in the above-mentioned cast cap-shaped transmission plates, yet still enable the oil to be fed between units and the engine block via internal ducts in the transmission plate. The transmission plate must therefore be relatively thin, cheap to manufacture and must have relatively low weight, whilst obviating the need for external connecting hoses or pipes, with the attendant risk of damage. Description of the invention The above objective is achieved according to the invention in that the device of the type indicated in the introduction exhibits the features indicated in the characterising part of claim 1. Preferred, refined embodiments of the device according to the invention may also exhibit the features indicated in the dependent claims 2-10. The solution to the problem, according to the invention, is therefore based on the principle that the plate supporting the units incorporate one or more internal oil distribution ducts, each consisting of a groove made in the surface of the plate supporting the units by cutting machining or cold forming in the plate, which groove, on the surface of the plate, is covered by means of a cover plate which is secured to the supporting plate. Every such oil distribution duct is connected to the lubricating oil duct in the engine block and to at least one of the units concerned. According to a preferred embodiment each oil distribution duct is essentially straight and continuous and connected at one end to the lubricating oil system of the engine and at the other end to one of the units. The oil distribution ducts consist appropriately of grooves of the same width which are milled into the supporting plate of the units and are covered with individual cover plates. The cover plate should preferably be incorporated in the supporting plate, by shape and/or friction or by other suitable method, e.g. welding. This fastening arrangement may, for example, be achieved by securing the cover plate in a dovetail groove overlapping the distribution duct and extending along the entire length of the duct groove, with a cross-section exceeding the width of the duct groove. To achieve such fastening in such a dovetail groove the cover plate should suitably exhibit a somewhat arch-shaped cross-sectional profile before fastening, so that the cover plate can be fastened by upsetting the same along its centreline so that the cover plate edges are consequently pressed outwards and caused to engage lock-tight with the respective undercut edges of the dovetail groove. The lubricating oil connection between the respective oil distribution ducts and the lubricating oil duct of the engine block on the one hand, and the associated unit on the other, may quite simply consist of through holes at the respective ends of the distribution duct. These holes then extend between the bottom of the duct and the side of the unit supporting plate opposite the cover plate side. With an oil feed device according to the invention a situation is therefore created where the lubricating oil is fed via internal oil distribution ducts inside the unit supporting plate. This completely eliminates the need for external hoses or pipes between the engine bock and the respective additional units, which provides a much simpler solution from the design point of view, where the thickness of the unit supporting plate may be much less than the thickness achieved with a cast transmission cover. Brief description of the figures in the drawing The invention will now be explained and described in greater detail below with reference to embodiments and design details shown on the attached drawings. Fig. 1 shows an end view of a longitudinally mounted vehicle engine which is fitted on its rear end side with a unit supporting plate according to the invention secured to it; Fig. 2 shows on a larger scale a partial area of the unit supporting plate according to Fig. 1; Fig. 3 shows a cross-section along line III-III in Fig. 2; and Fig. 4 shows on an even larger scale a cross-section along line IV-IV in Fig. 2. Description of an embodiment The vehicle engine indicated in Fig. 1 is shown for the sake of simplicity merely i the form of an engine block 2, which in this case is the engine block for a longitudinally mounted diesel engine for a truck whose brakes are operated with a compressed air system. A unit supporting plate 4 is secured by means of screws (not shown) to the rear end side of engine block 2, shown in Fig. 1, on the front side of which plate, not shown in Fig. 1, may be mounted different units which, for operation, required to be fed with lubricating oil from the same lubricating oil system which provides the lubrication of the internal combustion engine, and which is therefore incorporated in engine block 2. The invention relates to a device with which oil from the lubricating oil system of the engine can be fed to units mounted on unit supporting plate 4 secured to and sealed against engine block 2. The rear end face or side 6 of engine block 2, shown in Fig. 1, is designed, and unit supporting plate 4 is secured to that end side, in such a manner that plate 4 covers a surface area of engine block 2 which includes at least one engine block duct 8 connected to the lubricating oil system in engine block 2, which duct opens out towards adjacent unit supporting plate 4. In the embodiment shown duct 8 is connected to the lubricating oil system of the engine by an oil inlet port 10. On the side of unit supporting plate 4 facing away from engine block 2 there are, in the embodiment shown, three oil distribution ducts 14 cut into plate 4, from its side 12, see in particular Figs. 2-4. Each such duct 14 is connected at one end, in terms of flow, to engine block duct 8 and at its other end to the respective associated units supported by and mounted on unit supporting plate 4. Fig. 1 shows the mounting points for two of the units in the form of circular openings 16, 20. The unit at opening 16 may, for example, be a flange-mounted air compressor for the compressed air system of the vehicle brakes. The unit mounted at opening 20 may, for example, be the flange-mounted injection pump of the engine. The third unit shown in Fig. 2 may be a turbocompound unit, e.g. of the type marketed by Scania. As most clearly shown in Figs. 3 and 4, each distribution duct 14 consists of a groove 22 made preferably by cutting machining in surface 12 of unit supporting plate 4, which groove is covered by means of a cover plate 24 secured in plate 4 level with surface 12. In practice the simplest method of producing grooves 22 should be by milling. Grooves 22 of distribution ducts 14, preferably of rectangular cross-section (see Fig. 4), suitably have their associated cover plates 24 incorporated in unit supporting plate 4 by shape and/or friction. As most clearly shown in Figs. 3 and 4, each cover plate 24 is incorporated in unit supporting plate 4 in a dovetail groove 26 overlapping the associated distribution duct 14, with edge sides undercut inside plate 4. This groove 26 extends along the entire length of duct groove 22 and exhibits a cross-section B, which exceeds width V of duct groove 22. The edge sides of dovetail groove 26 may be undercut at an angle of the order of 10°, giving a total dovetail groove angle α of the order of 20°. Cover plate 24 secured in dovetail groove 26 exhibits a somewhat arch-shaped cross-sectional profile P before fastening, as shown in Fig. 4 (much exaggerated), in the form of a dot-dash contour. Because of this arch-shaped cross-sectional profile P cover plate 24 can be secured in dovetail groove 26 by upsetting (pressing in) the plate along its centreline M, so that the edges of the cover plate are pressed outwards and are caused to engage lock-tight, and sealed, with the undercut edge side surfaces of dovetail groove 26. As shown in Fig. 3 oil distribution duct 14 is connected to engine block duct 8 and to an oil duct 28 in its associated unit 18 via a first and second connection 32, 34 respectively, here in the form of a pair of holes 32 and 34 passing through the unit supporting plate at the ends of bottom 36 of duct 14. A sealing ring 38 is provided at the opening into duct 28 in unit 18. In the embodiment shown in Fig. 1 unit supporting plate 4 is conceived as being secured to engine block 10 at the end of the engine adjacent to a clutch (not shown) connected to the engine. This clutch projects from the engine block through opening 40, shaped as an upside down U, on the lower section of end side 6 of engine block 2. Unit supporting plate 4 may therefore be suitably called a transmission plate in this case because it is located at the transmission end of the engine. As shown in Fig. 1 transmission plate 4 projects at right angles to the longitudinal axis of the engine on both sides of the engine, and supports on each side at least one unit, as indicated by openings 16, 20. The embodiment described above will not restrict the scope of the invention, which may also be take the form of other embodiments. For example, each distribution duct can be provided with connections to several units. Moreover, the appearance of the ducts may be varied without departing from the general concept of the invention. Although the embodiment described above and shown in the drawing is conceived principally to represent the invention where applied to the engine of a truck with injection pump, air compressor and turbocompound unit, the invention may equally be applied, of course, to passenger cars or other vehicles where there is a requirement for mounting some kind of unit on the vehicle engine. Nor does the invention merely relate to vehicles, but may also be used in other engine applications.

Claims: Device for feeding oil from the lubricating oil system of an internal combustion engine to at least one or more units (16, 18, 20) mounted on a unit supporting plate (4) secured to the engine, characterised in that the unit supporting plate (4) is provided with at least one oil distribution duct (14) in the plate, which duct has at least one first connection (32) to the lubricating oil system of the engine, and at least one second connection (34) to one of the units, which distribution duct (14) consists of a groove (22) made from one surface (12, 13) of the unit supporting plate (4), in the plate, which groove is covered, on the surface of the plate by means of a cover plate (24) secured to the plate (4). Device according to claim 1, characterised in that the groove (22) is made in the unit supporting plate (4) on the side (12) facing away from the engine block (2), where the groove (22) is essentially straight and continuous. Device according to one of claims 1-2, characterised in that the first connection (32) is connected to an engine block duct (8) connected to the lubricating oil system of the engine. Device according to one of claims 1-3, characterised in that the unit supporting plate (4) is an essentially flat plate containing several separate oil distribution ducts (14), each of which is connected at one end to the engine block duct (8) and at the other end to each of its associated units (16, 18, 20), where each groove (22) is provided with its own cover plate (24). Device according to claim 4, characterised in that the oil distribution ducts (14) consist of grooves, preferably of the same width, made in the unit supporting plate (4) by cutting machining, and covered with individual cover plates (24). Device according to one of claims 1-5, characterised in that each grove (22) has its own associated cover plate (24) secured in the unit supporting plate by shape and/or friction. Device according to claim 6, characterised in that the respective cover plates (24) are secured in the unit supporting plate (4) in a dovetail groove (26) which overlaps the associated distribution duct (14) and which extends the entire length of the groove (22) and exhibits a cross-section (B) which exceeds the width (V) of the duct groove. Device according to claim 7, characterised in that the cover plate (24) secured in the dovetail groove (26) exhibits a somewhat arch-shaped cross-sectional profile (P) before fastening, enabling the cover plate to be fastened in the dovetail groove (26) by upsetting the plate in the centre so that the cover plate edges are pressed outwards and are caused to engage lock-tight with the respective undercut edge side surfaces of the dovetail groove (26). Device according to one of claims 2-8, characterised in that the first and second connection (32, 34) respectively consist of through holes extending, at the respective ends of the duct (14), between the bottom (36) of the duct and the side (13) of the unit supporting plate (4) facing towards the engine block. Device according to one of the previous claims, characterised in that the unit supporting plate (4) is secured to the engine at the end of the engine bock (2) adjacent to a clutch connected to the engine, and in that the unit supporting plate (4) projects to the side from the engine bock on both sides of the engine, and supports on each side at least one of the units (16, 18, 20).

Inventors: FRANSSON HAKAN, OERNING PETER, FRANSSON, HAKAN, OERNING, PETER, Örning, Peter
Applicants: SCANIA CV AB, SCANIA CV AKTIEBOLAG
Application year: 1994
Main classification: F01M11
IPC codes: F01M9, F01M11, F01M1, F02F7